When HP kinda, sorta killed webOS as a money making endeavor, they promised to keep it alive as an open source project, but offered little in the way of concrete details. According to The Verge they've partially pulled back the curtain, revealing that Open webOS 1.0 should arrive in September.

Along with news of the OS' rebirth, they also released the 1.0 version of their Javascript-based Enyo framework for Javascript app, and it contains parts of what will come in the 2.0 release. The 2.0 components will allow apps developed for webOS to run on other platforms and browsers. [HP via The Verge]